Clarence a



(No ModeL) l U. A. MACY.

SAFETY DEVICE FOR ELEVATORS.

No. 547,493; Patented 001;. a, 1895.

CaZZa 1 A ftorzzeys ANDREW B GRAHAM. PHUTO-UTMO WASH|NGTDN.B.C.

rn'rs A CLARENCE A. MACY, OF ROCHESTER, NEW YORK, ASSIGNOR TO THE GRAVESELEVATOR COMPANY, OF SAME PLACE.

SAFETY DEVICE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 547,493, dated October8, 1895.

Application filed April 30, 1895. Serial No. 547,684. (No model.) i

T0 at whom it may concern:

Be it known that I, CLARENCE A. MAGY, of.

Rochester, in the county of Monroe and State of New York, have inventedcertain new and useful Improvements in Safety Devices for Elevators; andI do hereby declare the following to be a full, clear, and exactdescription of the same, reference being had to the accompanying.drawings, forming a part of this specification, and to thereference-numerals marked thereon.

My present invention has for its object to improve the construction andoperation of that class of safety devices for elevators in which thedescent of the car is automatically arrested when from any cause theliftingcables are broken; and it consists in certain improvements inconstruction and combinations of parts, all as will be hereinafter fullydescribed, and the novel features pointed out in the claims at the endof this specification.

In the drawings, Figure 1 is a side elevation of a portion of thelifting-head of a freight-elevator car, one of the side plates beingremoved; Fig. 2, a plan view of the same.

. Fig. 3 is a view similar to Fig. 1, showing a form of the invention inwhich a double safety device is employed; Fig. 4, a vertical sectionalview on the line as or of Fig. 1.

Similar reference-numerals in the several figures indicate similarparts.

1 l'indicate the ordinary guides orways on which the elevator-cartravels, and 2 the rack, bar with which the safety catches or dogs onthe car are adapted to co-operate. The cross or draw head of the car maybe of the ordinary or any suitable construction, and is composed,preferably, of the two side beams 4; 1, connected at suitable intervalsby bolts and frames, and to which the suspending rods or standards 5 ofthe cars are attached, as shown. Arranged at the end of the cross-headand between the side plates thereof are the dogs or catches 6, pivotedat 7 and arranged relative to the rack-bars 2 so that when the lowerends are moved outward they will engage said racks and prevent thedescent of the car. One of these catches is arranged on each side of thecar, and at their upper ends are connected the outer ends of links 8,the inner ends of which are connected to pins 9, formed upon disks 10,arranged at or near the center of the heads, and both mounted andadapted to turn upon a bolt or pin 11. The pins for the two links arearranged upon opposite sides of the pivot bolt or pin, so that when thedisks (which are connected) are turned in one direction said links willbe moved toward the center of the cross-head and the dogs will be thrownout and engage the racks, and when turned in the other direction thecatches will be retracted to their normal position.

12 indicates the lifting or king bolt having the head at its lower endengaging. the cross-piece 13 on the head, while its upper end isconnected to the lifting-cables 14, in the present instance by means ofa suitable clevis 15, and connected to said king-bolt is a bolt or pin16, the opposite ends of which pro- 'ject outward and engage slots 17,formed in the two disks 10, the construction being such that when thebolt moves downward by rea son of the breaking of the cables orotherwise the disks will be permitted to rotate in a direction to causethe outward movement of the engaging-catches; but normally when the caris suspended upon said cables the pin 16 will hold the dogs positivelyout of engagement.

In freight-elevators which are adapted to carry a greater weight than,say, fifteen hundred pounds it is usual to employ means for operatingthe safety devices outside of the car, such as counterweights, which mayserve to counterbalance the car, or a weight which serves simply tooperate the safety devices, but does not counterweight the car, in bothinstances said weight being connected to a cable one end of whichtravels with the car, and in the drawings I have indicated such a cableby 18, connected to a link 19, the lower end of which is pivoted to thedisks 10 by a bolt 20, extending between and serving to connect them,said connected disks forming what I shall term a rotary member. Thisbolt,

it will be noticed, is somewhat nearer the pivot of the disks than thepin on the kingbolt, so that there is always a slight leverage in favorof the latter, the object of this being to prevent the operation of thesafety-catches when the car is suddenly arrested by the stoppage of themotor actuating the lifting-cable. From the above it will be understoodthat under normal circumstances the safety-dogs will be held retracted,as shown in Fig. 1; but if the lifting-cables should break the kingboltwill be dropped, and the weight-cable, pulling upon the link 19, willrotate the disks and move the links inward and the catches outward intoengagement with the racks.

In the use of elevators not designed to carry very heavy weights it isnot essential that a weight-operating cable be employed in addition tothe lifting-cable; but in order that-my safety device may be used insuch a construction I employ tension-springs 21, one end of each of saidsprings being connected to one of the links operating one of the dogs,while the other end is connected, preferably, to the link operating theother dog, as shown particularly in Fig. 3, or, if desired, to the upperend of the dog itself. From this construction it will be seen that thesprings are kept normally under tension and the dogs retracted by theking-bolt, which is engaged with the disks, as before, but that if thelifting-cable breaks and the king-bolt drops the springs will serve tothrow out the dogs, causing them to engage the racks and arrest the car.Although two springs are shown it will be un derstood that one could beemployed.

I have shown in Fig. 3 both the weight-ca ble and the spring device foroperating the safety-catches, and they may be used together, if desired,the spring device serving to operate the catches if the weight should becaught in its ways or should fail otherwise to properly operate them,and this would enable me to use a lighter counterweight; but in practiceI prefer to employ the spring device alone for elevators carryingcomparativelylight loads, and the weight device, as in Fig. 1, forelevators carrying heavy loads. The disks, it will be noted, are ineffect levers connected and have no particular function as disks exceptstrength, so that their peripheries between the points of connection ofthe links, pins, and levers could be cut away, if desired; but I preferthe arrangement shown, as the disks may be made of cast-steel, it beingdesirable to dispense with forged parts in this class of devices on theground of economy. The pins 9 on the disks are prefer ably cast integralwith them, and their ends are turned over, as in Fig. 4, to prevent theremoval of the ends of thelinks,(though facilitating their application,)the outer ends being prevented from turning olf by the yokes atthe upperends of the catches,which embrace them, as shown.

Byemployin g two disks,connected as shown, and-which constitute what Ishall term a rotary member, I am enabled to mount the lifting or kingbolt in the middle of the car, and as the parts are balanced I avoid anypossibility of their cramping, and by employing the disks and links thedogs are operated by the longitudinal movement of the links 8,

thereby enabling me to employ a comparatively narrow cross-head for thecar.

I claim as my invention- 1. The combination with the racks arranged inan elevator-well, an elevator-car, the dogs or catches pivoted thereonand the links connected to them, of the rotary member to opposite sidesof the center of which the links are connected, the lifting cableengaging said member to rotate it in a direction to cause the links topull the dogs into engagement with the racks, and operating devicesengaging the member to rotate it in the other direction, but connectedat a shorter distance from the center of motion than the connection withthe lifting cable, substantially as described.

2. The combination with the racks arranged in an elevator-welhanelevator-car, the two connected disks thereon, the links connectedthereto, and the pivoted dogs connected to the links and adapted toengage the racks, of the lifting-cable, the king-bolt to which it isconnected engaging the disks, and preventing their movement in onedirection and also engaging the car, and operating devices for retatingthe disks when the lifting cable breaks, substantially as described.

3. The combination with the racks arranged in an elevator-well, anelevator-car, the connected rotary disks thereon, the dogs or catches,the links connected to them and to the disks on opposite sides of thecenter, of the lifting cable, the bolt to which it is connected engagingthe car and arranged between the disks and engaging them, the weightcable connected to the disks and tending to operate them to throw outthe catches, substantially as described.

4:. The combination with the racks arranged in the elevator-well, anelevator-car, the pivotpin or bolt, the two disks thereon, each. havingthe slot and the crank-pins on opposite sides of the center, the dogs orcatches, and the links connected to them and to the crankpins, of theking-bolt engaging the car having the cross-bolt engaging the slots inthe disk, and the weight-cable connected to the disks for turning them,substantially as described.

5. The combination with the racks arranged in an elevator-well, anelevator-car, the rotary member thereon, the king-bolt engaging the carand the rotary member, of the dogs or catches, the links connectedthereto and to the rotary member on opposite sides of the center, and aspring connecting the links for positively moving them in oppositedirections to cause the engagement of the catches with the racks,substantially as described.

6. The combination with an elevator-car, the pivoted catches or dogsarranged at the outer sides thereof, a rotary member at the middle ofthe can and links connected to the catches and to the rotary member, ofthe kingbolt engaging the car and the rotary member, the lifting cableconnected to the king-bolt, the Weight-cable connected directly to thero- IIO tarymember on the side of the center opposite the king-bolt,substantially as described.

7. The combination with the car, the stationary pivot-bolt thereon, thetwo disks, each having the slots, the pins with curved ends, and thebolt connecting them on one side of the pivot, of the pivoted catches,the links pivoted to them and engaging the pins on the disks, theking-bolt having the cross-pin, and engaging the car, the lifting-cable,and the weight-cable connected to the bolt connecting the disks,substantially as described.

8. The combination with the racks arranged in an elevator-Well, anelevator-car, the dogs .to the opposite side, and the springs operatingupon the dogs to cause their projection,

substantially as described and for the purpose specified.

CLARENCE A. MACY.

Witnesses:

F. F. CHURCH, G. A. RODA.

